Oxidation of pentafluoro-N-(2,3,4,5,6-pentafluorobenzylidene) aniline

Conclusions The reaction of pentafluoro-N-(2,3,4,5,6-pentafluorobenzylidene) aniline with peracetlc acid or 90% hydrogen peroxide in CH₂Cl₂ at 20°C yields -pentafluoroanilino-2,3,4,5,6-pentafluorobenzylhydroperoxide. Its capability for thermal and photolytic transformation into bis (-pentafluoroanilino-2,3,4,5,6-pentafluorobenzyl) peroxide was shown.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 665–668, March, 1985.     

Nuclear spectroscopy in 48V via the 34S(16O,pn)48V reaction

The electromagnetic decays of 18 bound states in ⁴⁸V have been studied via the ³⁴S(¹⁶O, pn)⁴⁸V reaction, at incident ion energies of 30–36 MeV. At these energies pn, 2pn, 2p, αp, αn and 2n exit channels were open. Spins and parities of the levels as well as the branching and mixing ratios of their decay γ-rays have been obtained from angular distribution, excitation function, and high resolution γ-γ and n-γ coincidence measurements. Six, and possibly seven, members of a very pure rotational negative parity band have been identified. This band is based on a 1^? low-lying core excited state with probable configuration $\text{(π}\text{d}{}_{\mathrm{<mtext>3</mtext><mtext>2</mtext>}}\text{)}{}^{\mathrm{?1}}\text{(π}\text{f}{}_{\mathrm{<mtext>7</mtext><mtext>2</mtext>}}\text{)}{}^4\text{(ν}\text{f}{}_{\mathrm{<mtext>7</mtext><mtext>2</mtext>}}\text{)}{}^5$.     

Large transient magnetic fields for rare-earth ions recoiling in gadolinium and g-factors of high-spin states in 156, 158, 160Gd

We have determined the transient magnetic field for Coulomb-excited rare-earth nuclei recoiling with velocities in the range between 0.7ν₀ and 6ν₀ into ferromagnetic gadolinium cooled to a temperature T = 80 K. Measured and calculated g-factors in ¹⁶⁹Tm have been used as calibration standards. The transient field is found at first to increase with increasing recoil velocity, and then to level off, approaching a nearly constant value of 5.5 kT at ν = 6ν₀. At the higher velocities (3ν₀ < ν < 6ν₀) the transient fields for ¹⁶⁹Tm recoils in gadolinium are a factor of 1.42 ± 0.12 larger than those in iron, whereas the densities of polarized electrons are the same in both ferromagnets. This result demonstrates that an explanation of the transient field must take into account the atomic structure of the host (and probably also that of the recoil). The transient field is too large to be described only in a statistical picture in which inner-shell (ns) vancancies are filled by capture of polarized (4f) electrons. Possible mechanisms may involve either polarization transfer from the outer shells by spin-flip interactions, or direct vacancy polarization by diabatic molecular orbitals.The transient field calibration has been corroborated making use of known g-factors of low-spin states in ^{156, 158, 160}Gd populated by Coulomb excitation of thick Gd single crystals. For the high-spin states in these nuclei, the g-factors are found to decrease slightly, with the ratio $\text{g(10}{}^{\mathrm{+}}\text{)}\text{g(2}{}^{\mathrm{+}}$) reduced to 0.89±0.12, 0.83±0.11, and 0.93±0.13, respectively. Similar decreases have been observed previously for other N = 90?96 nuclei.